Precise shot blasting method suitable for complex undercarriage structural parts

Abstract

The invention discloses a precise shot blasting method suitable for a complex undercarriage structural part, and belongs to the technical field of part surface modification, and the precise shot blasting method comprises the following steps: step a, dividing a shot blasting area of the part into an outer circular surface area, a complex outer surface area, an inner surface small hole area and a deep inner hole area; b, the part is vertically clamped, and shot blasting is conducted on the outer circle face area of the part through an outer surface spray gun; c, shot blasting is conducted on the complex outer surface area of the part through an outer surface spray gun; step d, performing shot blasting on a small hole area on the inner surface by adopting a small hole spray gun; and e, shot blasting is conducted on the deep inner hole area through a deep inner hole spray gun. Through reasonable shot blasting area division and shot blasting path planning, the shot blasting coverage rate uniformity and the shot blasting strength uniformity of the inner surface and the outer surface of the part are improved.

Description

Technical Field

[0001] This invention relates to the field of surface modification technology for parts, and more particularly to a precision shot peening method suitable for complex landing gear structural parts. Background Technology

[0002] Shot peening is now widely integrated with robotics, enabling more precise directional shot peening of complex parts. This results in more even shot peening intensity and coverage, further improving the overall performance of the parts. Two key indicators for evaluating shot peening quality are shot intensity and coverage. Shot intensity is related to the type of shot, shot velocity, shot flow rate, and peening angle, while coverage is related to shot flow rate and peening time. Different shot peening parameters lead to different peening effects.

[0003] When shot peening complex landing gear structural parts, the commonly used spray guns are the external surface spray gun and the pinhole spray gun. The external surface spray gun is mainly used for shot peening the outer surface of the parts, while the pinhole spray gun is mainly used for shot peening the inner surface and inner holes of the parts.

[0004] When shot peening complex landing gear structural parts, the main difficulty lies in dividing the shot peening area and setting the shot peening path. The division of the area and the planning of the path also determine the integrity of the shot peening reinforcement coverage, the uniformity of the shot peening intensity, the uniformity of the shot peening coverage, and the shot peening production efficiency.

[0005] The current requirements for shot peening technology of complex landing gear structural parts are numerous and the path planning is complicated. When using robots to program, complex areas are very likely to cause uneven shot peening coverage and uneven shot peening intensity. At the same time, the robot or spray gun may interfere with the parts, resulting in damage to the parts.

[0006] Chinese patent document CN217575638U, published on October 14, 2022, discloses a testing device for confirming the shot peening strength of the inner bore of aircraft landing gear parts. The device comprises a mounting base, a support frame, an adjusting top plate, a fastening bracket, a retainer, and an Alman test piece. The mounting base has a horizontal surface on its top. The support frame is vertically fixed to the horizontal surface. The adjusting top plate is slidably connected to the top of the support frame. The fastening bracket is vertically fixed to the end of the adjusting top plate away from the support frame. The bottom surface of the fastening bracket is flat. The fastener rests against the horizontal surface, which supports the fastening bracket. A first vertical surface is provided on the side of the support frame facing the fastening bracket, and a second vertical surface is provided on the side of the fastening bracket facing the support frame. A shot-peening simulation space, simulating the inner bore of an aircraft landing gear component, is formed between the second vertical surface and the first vertical surface. The retainer is detachably mounted on the second vertical surface, and the Almen test piece is detachably mounted on the retainer, facing the first vertical surface. During testing, the Almen test piece is adjusted relative to the first vertical surface by sliding the top plate. The distance between the first vertical planes.

[0007] The patent document discloses a testing device for confirming the shot peening intensity of the inner bore of aircraft landing gear parts, which solves the problem that the test position of the Almen specimen is inconsistent with the position of the shot peening area of ​​the inner bore of the aircraft landing gear part during shot peening. However, the uniformity of shot peening coverage and shot peening intensity on the inner and outer surfaces of the parts is not ideal. Summary of the Invention

[0008] In order to overcome the shortcomings of the prior art, the present invention provides a precision shot peening method suitable for complex landing gear structural parts. The present invention improves the uniformity of shot peening coverage and shot peening intensity on the inner and outer surfaces of the parts by rationally dividing the shot peening area and planning the shot peening path.

[0009] This invention is achieved through the following technical solution: A precision shot peening method applicable to complex landing gear structural parts, characterized by comprising the following steps: Step a: Divide the shot-peening area of ​​the part into the outer circular surface area, the complex outer surface area, the inner surface small hole area, and the deep inner hole area. Step b: Vertically clamp the part and shot peening the outer circular area of ​​the part with an external surface spray gun; Step c: Use an external surface spray gun to shot peen the complex external surface areas of the part; Step d: Use a small-hole spray gun to shot peen the small-hole area on the inner surface; Step e: Use a deep internal hole shot blasting gun to shot peen the deep internal hole area.

[0010] In step b, shot peening with an external surface spray gun means that the angle between the external surface spray gun and the surface of the part being shot is kept at 80-90°, and the external surface spray gun is rotated at 10-30 rpm and moved up and down to perform shot peening.

[0011] In step b, the outer surface spray gun is used to perform shot peening by rotating at 20 rpm and moving up and down.

[0012] In step b, the outer surface spray gun is either a single spray gun or a double spray gun. In step c, shot peening of the complex outer surface area of ​​the part refers to maintaining the angle between the outer surface spray gun and the surface of the part to be shot peened at 60-70° and moving along the shape of the part at a constant speed.

[0013] In step c, the outer surface spray gun is a single spray gun, and the shot peening angle is 65°. In step d, shot peening the small hole area on the inner surface refers to shot peening by rotating the small hole spray gun while moving along the axial direction of the small hole at a constant feed speed, or shot peening by moving the nozzle of the small hole spray gun at a constant speed along the inner surface of the rib.

[0014] In step e, shot peening the deep inner hole area means that the deep inner hole shot gun rotates while moving along the axial direction of the deep inner hole at a constant feed speed. After each shot peening, the shot is turned off, and the shot is cleaned inside the deep inner hole area by purging air with the deep inner hole shot gun.

[0015] The outer circular surface region includes the outer circular region of the rotating shaft and the region that approximates the outer circle when the part rotates.

[0016] The area where the part is approximately an outer circle when it rotates refers to the area where the distance between the outer surface spray gun and the shot peening area is within ±10mm and the shot peening angle is within ±10°.

[0017] The complex outer surface region includes an irregular outer surface region, a web region, and a chamfered region.

[0018] The inner surface perforated area includes the perforated area, the blind hole area, and the inner surface area of ​​the rib.

[0019] The beneficial effects of this invention are mainly reflected in the following aspects: 1. The present invention comprises the following steps: Step a) dividing the shot-peening area of ​​the part into an outer circular surface area, a complex outer surface area, an inner surface small hole area, and a deep inner hole area; Step b) vertically clamping the part and shot-peening the outer circular surface area of ​​the part using an outer surface shot blasting gun; Step c) shot-peening the complex outer surface area of ​​the part using an outer surface shot blasting gun; Step d) shot-peening the inner surface small hole area using a small hole shot blasting gun; Step e) shot-peening the deep inner hole area using a deep inner hole shot blasting gun. Compared with the prior art, the invention improves the uniformity of shot peening coverage and shot peening intensity on the inner and outer surfaces of the part through reasonable shot peening area division and shot peening path planning. 2. This invention achieves the effects of complete shot peening coverage of the inner and outer surfaces of complex landing gear parts, uniform and controllable shot peening coverage, and uniform shot peening intensity. 3. This invention achieves precision shot peening strengthening of complex landing gear parts and improves shot peening efficiency. 4. This invention comprehensively utilizes external surface spray guns, small-hole spray guns, and deep internal hole spray guns to divide complex landing gear parts into four shot peening areas, reducing the number of times the clamping method and spray gun need to be changed during the shot peening process, and greatly improving shot peening efficiency.

[0020] 5. This invention organically combines shot peening area division and shot peening path planning, which greatly reduces the risk of collision between the robot and tooling or parts, and improves shot peening safety.

[0021] 6. This invention, by rationally dividing the shot peening area and comprehensively utilizing the outer surface spray gun, the small hole spray gun, and the deep inner hole spray gun, achieves the purpose of uniform shot peening coverage on the inner and outer surfaces of the parts, and improves the uniformity of shot peening intensity.

[0022] 7. This invention enables precision shot peening strengthening of complex landing gear parts and has good applicability. Attached Figure Description The present invention will now be further described in detail with reference to the accompanying drawings and specific embodiments: Figure 1 This is a flowchart of the present invention; Figure 2 A structural schematic diagram of a complex landing gear component; The markings in the diagram are: 1. Outer circular surface area, 2. Complex outer surface area, 3. Inner surface small hole area, 4. Deep inner hole area. Detailed Implementation Example 1 See Figure 1 A precision shot peening method applicable to complex landing gear structural parts includes the following steps: Step a: Divide the shot-peening area of ​​the part into outer circular surface area 1, complex outer surface area 2, inner surface small hole area 3, and deep inner hole area 4; Step b: Vertically clamp the part and use an external surface shot blasting gun to shot blast the outer circular area 1 of the part. Step c: Use an external surface spray gun to shot peen the complex external surface area 2 of the part; Step d: Use a small-hole spray gun to shot peen the small-hole area 3 on the inner surface; Step e: Use a deep internal hole shot blasting gun to shot peen the deep internal hole area 4.

[0023] This embodiment is the most basic implementation method. Step a: Divide the shot peening area of ​​the part into an outer circular surface area 1, a complex outer surface area 2, an inner surface small hole area 3, and a deep inner hole area 4; Step b: Vertically clamp the part and shot peen the outer circular surface area 1 of the part using an outer surface shot peening gun; Step c: Shot peen the complex outer surface area 2 of the part using an outer surface shot peening gun; Step d: Shot peen the inner surface small hole area 3 using a small hole shot peening gun; Step e: Shot peen the deep inner hole area 4 using a deep inner hole shot peening gun. Compared with the prior art, through reasonable shot peening area division and shot peening path planning, the uniformity of shot peening coverage and shot peening intensity on the inner and outer surfaces of the part is improved. Example 2 See Figure 1 A precision shot peening method applicable to complex landing gear structural parts includes the following steps: Step a: Divide the shot-peening area of ​​the part into outer circular surface area 1, complex outer surface area 2, inner surface small hole area 3, and deep inner hole area 4; Step b: Vertically clamp the part and use an external surface shot blasting gun to shot blast the outer circular area 1 of the part. Step c: Use an external surface spray gun to shot peen the complex external surface area 2 of the part; Step d: Use a small-hole spray gun to shot peen the small-hole area 3 on the inner surface; Step e: Use a deep internal hole shot blasting gun to shot peen the deep internal hole area 4.

[0024] In step b, shot peening with an external surface spray gun means that the angle between the external surface spray gun and the surface of the part being shot is kept at 80°, and the external surface spray gun is rotated at 10 rpm and moved up and down to perform shot peening.

[0025] In step b, the outer surface spray gun is used to perform shot peening by rotating at 20 rpm and moving up and down.

[0026] This embodiment is a preferred implementation method, which achieves the effects of complete shot peening coverage of the inner and outer surfaces of complex landing gear parts, uniform and controllable shot peening coverage, and uniform shot peening intensity. Example 3 See Figure 1A precision shot peening method applicable to complex landing gear structural parts includes the following steps: Step a: Divide the shot-peening area of ​​the part into outer circular surface area 1, complex outer surface area 2, inner surface small hole area 3, and deep inner hole area 4; Step b: Vertically clamp the part and use an external surface shot blasting gun to shot blast the outer circular area 1 of the part. Step c: Use an external surface spray gun to shot peen the complex external surface area 2 of the part; Step d: Use a small-hole spray gun to shot peen the small-hole area 3 on the inner surface; Step e: Use a deep internal hole shot blasting gun to shot peen the deep internal hole area 4.

[0027] In step b, shot peening with an external surface spray gun means that the angle between the external surface spray gun and the surface of the part being shot is kept at 90°, and the external surface spray gun is rotated at 20 rpm and moved up and down to perform shot peening.

[0028] In step b, the outer surface spray gun is a single spray gun. In step c, shot peening the complex outer surface area 2 of the part means maintaining the angle between the outer surface spray gun and the surface of the part to be shot peened at 60° and moving along the shape of the part at a constant speed.

[0029] This embodiment is another preferred implementation, which realizes precision shot peening strengthening of complex landing gear parts and improves shot peening efficiency. Example 4 See Figure 1 A precision shot peening method applicable to complex landing gear structural parts includes the following steps: Step a: Divide the shot-peening area of ​​the part into outer circular surface area 1, complex outer surface area 2, inner surface small hole area 3, and deep inner hole area 4; Step b: Vertically clamp the part and use an external surface shot blasting gun to shot blast the outer circular area 1 of the part. Step c: Use an external surface spray gun to shot peen the complex external surface area 2 of the part; Step d: Use a small-hole spray gun to shot peen the small-hole area 3 on the inner surface; Step e: Use a deep internal hole shot blasting gun to shot peen the deep internal hole area 4.

[0030] In step b, shot peening with an external surface spray gun means that the angle between the external surface spray gun and the surface of the part being shot is kept at 90°, and the external surface spray gun is rotated at 30 rpm and moved up and down to perform shot peening.

[0031] In step b, the outer surface spray gun is a dual spray gun. In step c, shot peening the complex outer surface area 2 of the part means maintaining the angle between the outer surface spray gun and the surface to be shot peened at 65° and moving along the shape of the part at a constant speed.

[0032] In step c, the outer surface spray gun is a single spray gun.

[0033] In step d, shot peening the small hole area 3 on the inner surface means that the small hole spray gun rotates while moving along the axial direction of the small hole at a constant feed speed, or the small hole spray gun nozzle moves at a constant speed along the inner surface of the rib for shot peening.

[0034] This embodiment is another preferred implementation method. It comprehensively utilizes the outer surface spray gun, the small hole spray gun and the deep inner hole spray gun to divide the complex landing gear parts into four shot peening areas, reducing the number of times the clamping method and spray gun need to be changed during the shot peening process, and greatly improving the shot peening efficiency.

[0035] Example 5 See Figure 1 A precision shot peening method applicable to complex landing gear structural parts includes the following steps: Step a: Divide the shot-peening area of ​​the part into outer circular surface area 1, complex outer surface area 2, inner surface small hole area 3, and deep inner hole area 4; Step b: Vertically clamp the part and use an external surface shot blasting gun to shot blast the outer circular area 1 of the part. Step c: Use an external surface spray gun to shot peen the complex external surface area 2 of the part; Step d: Use a small-hole spray gun to shot peen the small-hole area 3 on the inner surface; Step e: Use a deep internal hole shot blasting gun to shot peen the deep internal hole area 4.

[0036] In step b, shot peening with an external surface spray gun means that the angle between the external surface spray gun and the surface of the part being shot is kept at 90°, and the external surface spray gun is rotated at 30 rpm and moved up and down to perform shot peening.

[0037] In step b, the outer surface spray gun is a dual spray gun. In step c, shot peening the complex outer surface area 2 of the part means maintaining the angle between the outer surface spray gun and the surface to be shot peened at 65° and moving along the shape of the part at a constant speed.

[0038] In step c, the outer surface spray gun is a single spray gun.

[0039] In step d, shot peening the small hole area 3 on the inner surface means that the small hole spray gun rotates while moving along the axial direction of the small hole at a constant feed speed, or the small hole spray gun nozzle moves at a constant speed along the inner surface of the rib for shot peening.

[0040] In step e, shot peening the deep inner hole region 4 means that the deep inner hole shot gun rotates while moving along the axial direction of the deep inner hole at a constant feed speed. After each shot peening, the shot is turned off, and the shot is cleaned inside the deep inner hole region 4 by purging air with the deep inner hole shot gun.

[0041] The outer circular surface region 1 includes the outer circular region of the rotating shaft and the region that is approximately an outer circle when the part rotates.

[0042] This embodiment is another preferred implementation method, which organically combines shot peening area division and shot peening path planning, greatly reducing the risk of collision between the robot and tooling or parts, and improving shot peening safety.

[0043] Example 6 See Figure 1 A precision shot peening method applicable to complex landing gear structural parts includes the following steps: Step a: Divide the shot-peening area of ​​the part into outer circular surface area 1, complex outer surface area 2, inner surface small hole area 3, and deep inner hole area 4; Step b: Vertically clamp the part and use an external surface shot blasting gun to shot blast the outer circular area 1 of the part. Step c: Use an external surface spray gun to shot peen the complex external surface area 2 of the part; Step d: Use a small-hole spray gun to shot peen the small-hole area 3 on the inner surface; Step e: Use a deep internal hole shot blasting gun to shot peen the deep internal hole area 4.

[0044] In step b, shot peening with an external surface spray gun means that the angle between the external surface spray gun and the surface of the part being shot is kept at 90°, and the external surface spray gun is rotated at 30 rpm and moved up and down to perform shot peening.

[0045] In step b, the outer surface spray gun is a dual spray gun. In step c, shot peening the complex outer surface area 2 of the part means maintaining the angle between the outer surface spray gun and the surface of the part to be shot peened at 70° and moving along the shape of the part at a constant speed.

[0046] In step c, the outer surface spray gun is a single spray gun.

[0047] In step d, shot peening the small hole area 3 on the inner surface means that the small hole spray gun rotates while moving along the axial direction of the small hole at a constant feed speed, or the small hole spray gun nozzle moves at a constant speed along the inner surface of the rib for shot peening.

[0048] In step e, shot peening the deep inner hole region 4 means that the deep inner hole shot gun rotates while moving along the axial direction of the deep inner hole at a constant feed speed. After each shot peening, the shot is turned off, and the shot is cleaned inside the deep inner hole region 4 by purging air with the deep inner hole shot gun.

[0049] The outer circular surface region 1 includes the outer circular region of the rotating shaft and the region that is approximately an outer circle when the part rotates.

[0050] The area where the part is approximately an outer circle when it rotates refers to the area where the distance between the outer surface spray gun and the shot peening area is within ±10mm and the shot peening angle is within ±10°.

[0051] The complex outer surface region 2 includes an irregular outer surface region, a web region, and a chamfered region.

[0052] The inner surface perforation region 3 includes a perforation region, a blind hole region, and a rib inner surface region.

[0053] This embodiment is the best implementation method. By reasonably dividing the shot peening area and making comprehensive use of the outer surface spray gun, the small hole spray gun and the deep inner hole spray gun, the purpose of uniform shot peening coverage of the inner and outer surfaces of the parts is achieved, and the uniformity of shot peening intensity is improved.

[0054] It achieves precision shot peening strengthening of complex landing gear parts and has good applicability. The invention will now be described using the landing gear outer cylinder part as an example. See below. Figure 2 : Shot peening area 1: Shot peening area on the outer circular surface; When shot peening area 1, a double shot gun is used to shot peen the outer circular area 1. The shot peening angle is selected as 90°. The shot peening distance is determined according to the actual situation and kept within ±10mm. At the same time, non-shot peening areas, such as small holes and threads, are protected. Shot peening area 2: Complex outer surface area 2; When shot peening area 2, a single spray gun is used to shot peen the complex outer surface. The shot peening angle is selected as 60°. The shot peening distance is determined according to the actual situation and kept within ±10mm. The spray gun moves along the outer surface area and changes its posture to ensure that the shot peening angle is within the range of 60°±10°, while protecting the non-shot peening area. Shot peening area 3: Inner surface small hole area 3; When shot peening area 3, a small-hole spray gun is used to shot peen the small-hole area 3 on the inner surface. The shot peening distance is determined according to the actual situation. At the same time, the non-shot peening area is protected. Shot peening zone 4: Deep internal hole zone 4; When shot peening area 4, a deep bore shot blasting gun is used. The shot blasting distance is determined according to the actual size of the hole. At the same time, non-shot peening areas, such as threads, are protected. When performing deep bore shot peening, the shot is turned off after one shot peening. The deep bore shot blasting gun is then used to purge the shot inside the deep bore area 4 to clean it, so as to prevent the shot from accumulating at the bottom and covering the shot peening area.

Claims

1. A precision shot peening method applicable to complex landing gear structural parts, characterized in that, Includes the following steps: Step a: Divide the shot-peening area of ​​the part into the outer circular surface area (1), the complex outer surface area (2), the inner surface small hole area (3), and the deep inner hole area (4). Step b: Vertically clamp the part and shot peening the outer circular area (1) of the part with an outer surface spray gun; Step c: Use an external surface spray gun to shot peen the complex external surface area (2) of the part; Step d: Use a small-hole spray gun to shot peen the small-hole area (3) on the inner surface; Step e: Use a deep internal hole spray gun to shot peen the deep internal hole area (4).

2. The precision shot peening method for complex landing gear structural parts according to claim 1, characterized in that: In step b, shot peening with an external surface spray gun means that the angle between the external surface spray gun and the surface of the part being shot is kept at 80-90°, and the external surface spray gun is rotated at 10-30 rpm and moved up and down to perform shot peening.

3. The precision shot peening method for complex landing gear structural parts according to claim 2, characterized in that: In step b, the outer surface spray gun is used to perform shot peening by rotating at 20 rpm and moving up and down.

4. The precision shot peening method for complex landing gear structural parts according to claim 1, characterized in that: In step b, the outer surface spray gun is either a single spray gun or a double spray gun.

5. The precision shot peening method for complex landing gear structural parts according to claim 1, characterized in that: In step c, shot peening of the complex outer surface area (2) of the part refers to maintaining the angle between the outer surface spray gun and the sprayed surface of the part at 60-70° and performing shot peening along the shape of the part at a constant moving speed.

6. A precision shot peening method for complex landing gear structural parts according to claim 5, characterized in that: In step c, the outer surface spray gun is a single spray gun with a shot peening angle of 65°.

7. The precision shot peening method for complex landing gear structural parts according to claim 1, characterized in that: In step d, shot peening the small hole area (3) on the inner surface means that the small hole spray gun rotates while moving along the axial direction of the small hole at a constant feed speed for shot peening, or the small hole spray gun nozzle moves at a constant speed along the inner surface of the rib for shot peening.

8. A precision shot peening method for complex landing gear structural parts according to claim 1, characterized in that: In step e, shot peening the deep inner hole region (4) means that the deep inner hole spray gun rotates while moving along the axial direction of the deep inner hole at a constant feed speed. After each shot peening, the shot is turned off, and the shot inside the deep inner hole region (4) is cleaned by purging the air with the deep inner hole spray gun.

9. A precision shot peening method for complex landing gear structural parts according to claim 1, characterized in that: The outer circular surface region (1) includes the outer circular region of the rotating shaft and the region that is approximately an outer circle when the part rotates.

10. A precision shot peening method for complex landing gear structural parts according to claim 1, characterized in that: The area where the part is approximately an outer circle when it rotates refers to the area where the distance between the outer surface spray gun and the shot peening area is within ±10mm and the shot peening angle is within ±10°.

11. A precision shot peening method for complex landing gear structural parts according to claim 1, characterized in that: The complex outer surface region (2) includes an irregular outer surface region, a web region, and a chamfered region.

12. The precision shot peening method for complex landing gear structural parts according to claim 1, characterized in that: The inner surface perforation region (3) includes the perforation region, the blind hole region, and the inner surface region of the rib.

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